package lm.concurrency.day7;

import lombok.extern.slf4j.Slf4j;

import java.util.concurrent.locks.ReentrantReadWriteLock;

import static lm.concurrency.util.Sleeper.sleep;

@Slf4j
public class TestReadWriteLock {
    public static void main(String[] args) throws InterruptedException {
        DataContainer dataContainer = new TestReadWriteLock.DataContainer();
        new Thread(() -> {
            dataContainer.read();
        }, "t1").start();

        new Thread(() -> {
            dataContainer.read();
        }, "t2").start();
    }
    static class DataContainer {
        private Object data;
        private ReentrantReadWriteLock rw = new ReentrantReadWriteLock();
        private ReentrantReadWriteLock.ReadLock r = rw.readLock();
        private ReentrantReadWriteLock.WriteLock w = rw.writeLock();

        public Object read() {
            log.debug("获取读锁...");
            r.lock();
            try {
                log.debug("读取");
                sleep(1);
                return data;
            } finally {
                log.debug("释放读锁...");
                r.unlock();
            }
        }

        public void write() {
            log.debug("获取写锁...");
            w.lock();
            try {
                log.debug("写入");
                sleep(1);
            } finally {
                log.debug("释放写锁...");
                w.unlock();
            }
        }
    }
}


